OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
Fig 3 Copper plate (a)
3.5.Copper plate (b)
This plate is oriented in space such this electrons reflected from plate (a) as a result of the photo electric effect
move to it’s surface.
In Figure 4:
(c) is the negative terminal of the battery
(g) is the positive terminal of the battery
(a),(b) are the two copper plates
(f) is the external load
Fig 4 Arrangement of complete system
In this arrangement the battery terminal (c) that is the negative terminal is connected to a low wavelength ultra
violet lamp which is then connected to a copper plate (b).The positive terminal of the battery is connected to the
copper plate (a).
A semi cylindrical reflecting mirror is placed around the ultra violet lamp to reflect most of the photons on the
copper plate (a), the plate (a) is given some curvature in the direction of the lamp. This helps all the electron that
get emitted by the photo electric effect due to photons coming from the low wave length UV lamp to move
almost towards a point, This point lies on the plate (b).This arrangement containing the UV lamp ,semi
cylindrical reflecting mirror and the copper plates (a)&(b) are enclosed in a vacuum bulb. And the load is
connected to terminals (1) and (2).
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